/**
 * UGENE - Integrated Bioinformatics Tools.
 * Copyright (C) 2008-2020 UniPro <ugene@unipro.ru>
 * http://ugene.net
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#ifndef _U2_LOAD_REMOTE_DOCUMENT_TASK_H_
#define _U2_LOAD_REMOTE_DOCUMENT_TASK_H_

#include <QAuthenticator>
#include <QNetworkReply>
#include <QXmlReader>

#include <U2Core/DocumentProviderTask.h>
#include <U2Core/GUrl.h>
#include <U2Core/NetworkConfiguration.h>

class QEventLoop;
class QTimer;

namespace U2 {

// Entrez tools variables
#define ENSEBL_ID "ensembl"
#define GENBANK_NUCLEOTIDE_ID "nucleotide"
#define GENBANK_PROTEIN_ID "protein"
#define GENBANK_FORMAT "gb"
#define FASTA_FORMAT "fasta"
#define GENBANK_WITH_PARTS "gbwithparts"
#define FORCE_DOWNLOAD_SEQUENCE_HINT "gbwithparts"

class Document;
class CopyDataTask;
class LoadDocumentTask;
class LoadDataFromEntrezTask;

class U2CORE_EXPORT RemoteDBRegistry {
    RemoteDBRegistry();
    QMap<QString, QString> queryDBs;
    QMap<QString, QString> httpDBs;
    QMap<QString, QString> hints;
    QMap<QString, QString> aliases;

public:
    QString getURL(const QString &accId, const QString &dbName);
    QString getDbEntrezName(const QString &dbName);
    void convertAlias(QString &dbName);
    QList<QString> getDBs();
    bool hasDbId(const QString &dbId);
    QString getHint(const QString &dbName);
    //TODO: move this to AppContext
    static RemoteDBRegistry &getRemoteDBRegistry();

public:
    static const QString ENSEMBL;
    static const QString GENBANK_DNA;
    static const QString GENBANK_PROTEIN;
    static const QString PDB;
    static const QString SWISS_PROT;
    static const QString UNIPROTKB_SWISS_PROT;
    static const QString UNIPROTKB_TREMBL;
};

class U2CORE_EXPORT RecentlyDownloadedCache : public QObject {
    Q_OBJECT
    QMap<QString, QString> urlMap;
    void loadCacheFromSettings();
    void saveCacheToSettings();

public:
    RecentlyDownloadedCache();
    ~RecentlyDownloadedCache();
    bool contains(const QString &fileName);
    void append(const QString &fullPath);
    void remove(const QString &fullPath);
    QString getFullPath(const QString &fileName);
    void clear() {
        urlMap.clear();
    }
};

class U2CORE_EXPORT EntrezUtils {
public:
    static const QString NCBI_ESEARCH_URL;
    static const QString NCBI_ESUMMARY_URL;
    static const QString NCBI_EFETCH_URL;
    static const QString NCBI_DB_NUCLEOTIDE;
    static const QString NCBI_DB_PROTEIN;
};

//Base class for loading documents
class U2CORE_EXPORT BaseLoadRemoteDocumentTask : public DocumentProviderTask {
    Q_OBJECT
public:
    BaseLoadRemoteDocumentTask(const QString &downloadPath = QString(), const QVariantMap &hints = QVariantMap(), TaskFlags flags = TaskFlags(TaskFlags_NR_FOSCOE | TaskFlag_MinimizeSubtaskErrorText));
    virtual void prepare();
    QString getLocalUrl() {
        return fullPath;
    }

    virtual ReportResult report();

    static bool prepareDownloadDirectory(QString &path);
    static QString getDefaultDownloadDirectory();

protected:
    virtual QString getFileFormat(const QString &dbid) = 0;
    virtual GUrl getSourceUrl() = 0;
    virtual QString getFileName() = 0;

protected:
    bool isCached();
    bool initLoadDocumentTask();
    void createLoadedDocument();

protected:
    GUrl sourceUrl;
    QString fileName;
    QString fullPath;
    QString downloadPath;
    QString format;
    QVariantMap hints;

    DocumentFormatId formatId;
    CopyDataTask *copyDataTask;
    LoadDocumentTask *loadDocumentTask;
};

class U2CORE_EXPORT LoadRemoteDocumentTask : public BaseLoadRemoteDocumentTask {
    Q_OBJECT
public:
    LoadRemoteDocumentTask(const GUrl &url);
    LoadRemoteDocumentTask(const QString &accId, const QString &dbName, const QString &fullPathDir = "", const QString &fileFormat = "", const QVariantMap &hints = QVariantMap());
    virtual void prepare();

    QString getAccNumber() const {
        return accNumber;
    }
    QString getDBName() const {
        return dbName;
    }

protected:
    virtual QString getFileFormat(const QString &dbid);
    virtual GUrl getSourceUrl();
    virtual QString getFileName();
    QList<Task *> onSubTaskFinished(Task *subTask);

private:
    QString getRetType() const;

    GUrl fileUrl;
    LoadDataFromEntrezTask *loadDataFromEntrezTask;
    QString accNumber;
    QString dbName;
};

class U2CORE_EXPORT BaseEntrezRequestTask : public Task {
    Q_OBJECT
public:
    BaseEntrezRequestTask(const QString &taskName);
    virtual ~BaseEntrezRequestTask();

protected slots:
    virtual void sl_replyFinished(QNetworkReply *reply) = 0;
    void sl_onError(QNetworkReply::NetworkError error);
    void sl_uploadProgress(qint64 bytesSent, qint64 bytesTotal);
    virtual void onProxyAuthenticationRequired(const QNetworkProxy &, QAuthenticator *);

protected:
    // method should be called from the thread where @networkManager is actually used
    void createLoopAndNetworkManager(const QString &queryString);

    QEventLoop *loop;
    QNetworkAccessManager *networkManager;
};

// This task makes queries to NCBI Entrez search engine, using eTools
// First step: query eSearch to get global Entrez index
// Second step: query eFetch to download file by index
// About eTools: http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=coursework&part=eutils

class U2CORE_EXPORT LoadDataFromEntrezTask : public BaseEntrezRequestTask {
    Q_OBJECT
public:
    LoadDataFromEntrezTask(const QString &dbId,
                           const QString &accNumber,
                           const QString &retType,
                           const QString &fullPath);

    void run();

private slots:
    void sl_replyFinished(QNetworkReply *reply);
    void sl_cancelCheck();

private:
    void runRequest(const QUrl &requestUrl);

    QNetworkReply *searchReply;    // TODO: I think, it is unsed variable. Check if you can remove it.
    QNetworkReply *downloadReply;
    QXmlSimpleReader xmlReader;
    QString db;
    QString accNumber;
    QString resultIndex;
    QString fullPath;
    QString format;
};

class U2CORE_EXPORT EntrezQueryTask : public BaseEntrezRequestTask {
    Q_OBJECT
public:
    EntrezQueryTask(QXmlDefaultHandler *resultHandler, const QString &query);

    void run();
    const QXmlDefaultHandler *getResultHandler() const;

private slots:
    void sl_replyFinished(QNetworkReply *reply);

private:
    void runRequest(const QUrl &requestUrl);

    QNetworkReply *queryReply;
    QXmlDefaultHandler *resultHandler;
    QXmlSimpleReader xmlReader;
    QString query;
};

// Helper class to parse NCBI Entrez eSearch results
class U2CORE_EXPORT ESearchResultHandler : public QXmlDefaultHandler {
    bool metESearchResult;
    QString errorStr;
    QString curText;
    QList<QString> idList;

public:
    ESearchResultHandler();
    bool startElement(const QString &namespaceURI, const QString &localName, const QString &qName, const QXmlAttributes &attributes);
    bool endElement(const QString &namespaceURI, const QString &localName, const QString &qName);
    bool characters(const QString &str);
    bool fatalError(const QXmlParseException &exception);
    QString errorString() const {
        return errorStr;
    }
    const QList<QString> &getIdList() const {
        return idList;
    }
};

struct EntrezSummary {
    EntrezSummary()
        : size(0) {
    }

    QString id;
    QString name;
    QString title;
    int size;
};

// Helper class to parse NCBI Entrez ESummary results
class U2CORE_EXPORT ESummaryResultHandler : public QXmlDefaultHandler {
    bool metESummaryResult;
    QString errorStr;
    QString curText;
    EntrezSummary currentSummary;
    QXmlAttributes curAttributes;
    QList<EntrezSummary> results;

public:
    ESummaryResultHandler();
    bool startElement(const QString &namespaceURI, const QString &localName, const QString &qName, const QXmlAttributes &attributes);
    bool endElement(const QString &namespaceURI, const QString &localName, const QString &qName);
    bool characters(const QString &str);
    bool fatalError(const QXmlParseException &exception);
    QString errorString() const {
        return errorStr;
    }
    const QList<EntrezSummary> &getResults() const {
        return results;
    }
};

}    // namespace U2

#endif    // _U2_LOAD_REMOTE_DOCUMENT_TASK_H_
